{
  TF1 *fsin=new TF1("fsin","sin(x)",0,100);
  TF1 *f1=new TF1("f1","x-20",0,100);

  TF1 *fnew= (TF1*)fsin*(TF1*)f1;
  TCanvas *c1=new TCanvas("c1","c1",800,600);
  fnew->Draw();


}
